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The impactable GapMaster dock shelter is a full-access enclosure that provides high sealing efficiency. It can prevent the loss of expensive energy through exposed trailer door hinge gaps, and reduce intrusion of outside elements into your facility. 


  • Fully impactable side frames protect unit from damage from backing trailers.
  • Full, unobstructed access to trailer loads by sealing perimeter of trailer.
  • Rugged GapMaster® hooks on curtains seal hinge-gaps on swing-out trailer doors. Provides dramatic energy savings. Also helps eliminate problematic "white space" at dock door openings, minimizing infiltration of dust and pests.
  • HMWPE-wrapped foam side frames provide vertical stability and horizontal flexibility at extended projections ensuring maximum sealing effectiveness and longest product life.
  • Slim profile (6" std, 152mm) side frames create narrow footprint. Product fits tight spaces; can eliminate costly repositioning of lights, conduit, etc.
  • Detachable side curtains allow easy removal and reattachment for ventilation or to replace or exchange curtains when needed.
  • Fabric canopy header is independent of side frames, preventing damage to side frames and sagging of header under snow loads.
  • Integral, fabric-wrapped rain gutter diverts water off sides of shelter.
  • Header pivots to avoid damage if trailers back in off-center or higher than expected.
  • Available with high-strength Durathon™ fabric - friction-resistant, high-wear fabric for added life.
  • Available with Firefighter™ heat dissipating protection in head curtain to prevent burning from heat of trailer marker lights.


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